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- Isòmers òptics 1
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- Isòtops 59
- Isòtops de carboni 15
- Isòtops estables en ecologia 70
- Isòtops radioactius 5
- Isòtops radioactius en geologia 4
- Isquèmia 66
- Isquèmia cerebral 44
- Israel 16
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